短语词组短语sipped mispairing 滑行错配slipped mispairing 序列发生错配strand mispairing 滑链错配mispairing detail 错配base mispairing 碱基错配mispairing of base 碱基错配slipped -strand mispairing 滑链错配mispairing PCR -RFLP 错配PCR 返回 mispairing